Rear steer and BEC
 

Just added rear steer on the wraith and use a pair of hitec 5955tg servos and currently have a cc bec on the front servo. Now with rear steer need to do something for the rear too and debating between a cc bec pro or get a second cc bec and use these plugs CheapBatteryPacks - Crawler Accessories Crawlers battery Receiver Bypass Adapter to seperate both systems and bypass the Rx too. Thinking going with a second CC BEC for price and simplicity of separate systems.


And why rear steer is all worth it :)
MNorby's 4WS wraith carpet doughnuts - YouTube

You could likely do 2 5955/7955 off a single 10A BEC. Just make sure the EPA's are correctly set as a stalled servo is very high draw.
You would rarely use both servos at the exact same time, thus why it would work.
As to the adapter, I would do that, but I have an easy (for me) way to do it. It's not a bad idea, just not what I would do.